Who believes in conspiracy theories?

President Kennedy signs Proclamation 3504, authorizing the naval quarantine of Cuba on October 23, 1962.

Fifty years after President John F. Kennedy’s assassination, the belief that more than one person was involved remains strong. Based on our review of polls on a variety of conspiracy theories stretching back to World War II, we show that this conspiracy is the most widely held one in America. Here are some findings from our new AEI Public Opinion Study:

JFK: In an April 2013 poll, 59 percent said others were involved in a conspiracy to kill President Kennedy. Even as early as November of 1963, people had doubts as to whether Lee Harvey Oswald was the sole shooter. Sixty-two percent in 1963 told the National Opinion Research Center that other people were involved in the assassination.